june 4th according to cheap air.com. a lot of people have different strategies. i talked to some travel agents and they say you can do better here or there but the earlier the better. >> sometimes they go down before through go up. >> you can look at microsoft, binge travel, lot of different companies will have graphs that show you what works and what doesn't. it's okay to work later if you're on a flexible schedule and don't mind flying into a bigger city, like new york city, or l.a. so there's lots of different ways to do this. this is all based on data from 02013 so isn't necessarily predictive. we have a lot of stuff going on with relation to the oil fly and airlines and airlines not being able to fly. so this isn't gospel. >> all right, thank you. if you have secrets of your owns, ways you used to book a trip, we'd love to hear them. the united nations court